busybox: tune config according to BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/busybox/busybox.mk

@@ -125,6 +125,14 @@ define BUSYBOX_COPY_CONFIG
 	cp -f $(BUSYBOX_CONFIG_FILE) $(BUSYBOX_BUILD_CONFIG)
 endef
 
+# Disable shadow passwords support if unsupported by the C library
+ifeq ($(BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS),)
+define BUSYBOX_INTERNAL_SHADOW_PASSWORDS
+	$(call KCONFIG_ENABLE_OPT,CONFIG_USE_BB_PWD_GRP,$(BUSYBOX_BUILD_CONFIG))
+	$(call KCONFIG_ENABLE_OPT,CONFIG_USE_BB_SHADOW,$(BUSYBOX_BUILD_CONFIG))
+endef
+endif
+
 # We do this here to avoid busting a modified .config in configure
 BUSYBOX_POST_EXTRACT_HOOKS += BUSYBOX_COPY_CONFIG
 
@@ -138,6 +146,7 @@ define BUSYBOX_CONFIGURE_CMDS
 	$(BUSYBOX_SET_MDEV)
 	$(BUSYBOX_NETKITBASE)
 	$(BUSYBOX_NETKITTELNET)
+	$(BUSYBOX_INTERNAL_SHADOW_PASSWORDS)
 	@yes "" | $(MAKE) ARCH=$(KERNEL_ARCH) CROSS_COMPILE="$(TARGET_CROSS)" \
 		-C $(@D) oldconfig
 endef